diff --git a/flake.lock b/flake.lock
index c46b623..fc0fb08 100644
--- a/flake.lock
+++ b/flake.lock
@@ -62,16 +62,17 @@
         ]
       },
       "locked": {
-        "lastModified": 1656413262,
-        "narHash": "sha256-I8X1LaW/qoSWeBLK0N8GPOshIuXG9zyNyZUtKZYa0h4=",
+        "lastModified": 1655120294,
+        "narHash": "sha256-e0IXVoxH3o1QbLtHxANAg2CHdVE3jZBi5ifhh+6Vpcs=",
         "owner": "nix-community",
         "repo": "emacs-overlay",
-        "rev": "8772891c73e2809df5e5469d14535ea77e123d3e",
+        "rev": "29dcfbc1b29ae7281e95367e0f2358b44224a46e",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
         "repo": "emacs-overlay",
+        "rev": "29dcfbc1b29ae7281e95367e0f2358b44224a46e",
         "type": "github"
       }
     },
@@ -440,11 +441,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1656239181,
-        "narHash": "sha256-wW1xRFBn376yGloXZ4QzBE4hjipMawpV18Lshd9QSPw=",
+        "lastModified": 1656372800,
+        "narHash": "sha256-1u9SDLXvKix/QejNb2sY2J2QZXnbe/14MnLtn+ln9j0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "f2537a505d45c31fe5d9c27ea9829b6f4c4e6ac5",
+        "rev": "020c74014b9e2fa905bb4059c979965816cd9118",
         "type": "github"
       },
       "original": {
@@ -456,11 +457,11 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1656335358,
-        "narHash": "sha256-t0PZIFCKgjF2WQ0NC6ORigdGgLqQD3vtT+Jx/dhjNsY=",
+        "lastModified": 1656433693,
+        "narHash": "sha256-m29hSYsu2U+tnBo5v1/2RGo3lYY6KKb52MHV/89NeCs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "62de360d75419386b69ea4af4a8ce104949a8242",
+        "rev": "babb041b7167008af3faca4c78f9dd8c6e83ef3a",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index a3bff71..9f70c21 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,7 +9,7 @@
       inputs.nixpgks.follows = "nixpkgs";
     };
     emacs = {
-      url = "github:nix-community/emacs-overlay";
+      url = "github:nix-community/emacs-overlay/29dcfbc1b29ae7281e95367e0f2358b44224a46e";
       inputs.nixpkgs.follows = "nixpkgs";
     };
     mozilla = {
diff --git a/modules/protonmail.nix b/modules/protonmail.nix
index daad5b6..511bfb3 100644
--- a/modules/protonmail.nix
+++ b/modules/protonmail.nix
@@ -5,5 +5,7 @@
   environment.systemPackages = with pkgs; [
     protonmail-bridge
     pass
+    offlineimap
+    mu
   ];
 }